Study assessments will occur over four study visit days (Visit 2, Visit 3, Visit 4, and Visit 5). Fasting study procedures will occur in the morning of each visit day, and non-fasting procedures will occur following the administration of a standardized meal on the same day. All subjects will receive three doses of K2CG chewing gum and one placebo: 20 mg dose at Visit 2, 1.7 g placebo at Visit 3, 40 mg dose at Visit 4, and 60 mg dose at Visit 5. Subjects will not be aware of the specific gum dose or size at any study visit (single blind). The duration of gum chewing and timing of salivary collections will vary within each group.